JP2014046220A - Paint coating method, and paint coating device to base material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To thinly, uniformly and efficiently coat paint on a surface of a base material of a single leaf or continuous glass or resin film, a sheet and a plate.SOLUTION: A method is provided for coating its paint on a transferring base material surface by rotation of a coater roll by supplying the paint to the coater roll. In the method, the base material is a single leaf or continuous, and both the coater roll and a doctor roll or the doctor roll form a hydrophilic DLC film on a roll surface, and the doctor roll or a doctor blade is contacted with the coater roll, and the paint applied to an outer peripheral surface of the coater roll is thinly leveled, and the paint applied to the outer peripheral surface of the coater roll is coated on the transferring base material at an ordinary temperature under atmospheric pressure by the rotation of the coater roll.

Description

  The present invention is single-leaf or continuous, and is made of various materials such as glass, resin, and carbon. Films, sheets, plates, panels, etc. used in various fields (these are collectively referred to as “base material”). ), Resist paint (including functional resist paint), conductive paint, insulating paint, protective paint, reinforced paint, UV light shielding paint, antistatic paint, colored paint, functional coating agent, etc. The present invention relates to a method capable of coating a coating material with a desired thickness, in particular, a thickness of nanometer (nm) unit, and a coating apparatus used therefor.

  In recent years, photovoltaic generators have become widespread. Solar power generators have attracted attention as an alternative to nuclear power generators after the Great East Japan Earthquake. However, current solar power generators have limitations in power generation efficiency and productivity. One of the causes is the low conversion efficiency of the photoelectric conversion element. However, the photovoltaic generators installed outdoors are always exposed to wind and rain and dust. Another major factor is that light transmittance is deteriorated due to accumulation of scales or dust on the glass surface, blocking sunlight or increasing the refractive index.

  Conventionally, a functional resist film with a uniform thickness of a thin film of several hundreds of nanometers thick on the surface of the windshield in order to prevent the windshield from becoming dirty, reduce the refractive index of light, and efficiently incorporate sunlight. Is formed. A PVD method (physical vapor deposition method) is employed in most of the conventional functional resist film forming methods. Since the PVD method is a film formation in a vacuum environment, there is a problem that productivity is remarkably inferior.

  Various techniques for coating a substrate with a thin film, in particular, a DLC film, have been developed. One of them is the applicant's earlier patent application (Patent Document 1). Patent Document 1 discloses a method of forming a DLC film on a roll and a DLC film forming roll provided with the DLC film. In addition, there are Patent Documents 2 to 8 as a method for forming a DLC film and a member on which a DLC film is formed. Although the base material provided with the DLC film of Patent Documents 1 to 8 is improved in abrasion resistance, it is poor in hydrophilicity (has water repellency), so that coating unevenness is likely to occur (coating thickness tends to be uneven). Therefore, even when applied to the formation of a resist film on the surface of the windshield of a solar power generator, the prevention of stains on the windshield and the improvement of the refractive index are not always sufficient.

JP 2010-189694 A JP 2004-323993 A JP-A-11-181572 JP 2003-147527 A JP-A-10-219450 JP-A-10-29762 JP 2010-137540 A JP 2010-137543 A

  The object of the present invention is to uniformly apply various paints to the base materials used in various fields in order to protect the surface of the base materials, prevent contamination, improve light transmission, improve conductivity, and ensure insulation. Another object of the present invention is to provide a method and apparatus capable of coating a desired thickness.

  If the base material in this invention is a film form, a sheet form, plate shape etc., there will be no restriction | limiting in the material and an application, It does not ask | require in particular what kind of material and what field it is used. However, examples of the material include glass, resin, metal, and carbon. Examples of applications include windscreens for solar power generators, panels for optical systems (video equipment and office equipment), films, lenses, organic EL films, inorganic EL films, display panels for TVs and navigators, personal computers and mobile phones. Display panels and films for equipment, protective panels for lighting fixtures, glass for building materials and optical equipment, semiconductor wafers, protective panels for sensors, and other films, sheets, plates and panels used in various fields. is there.

[Coating method for base material]
In the method of coating a base material of the present invention, the paint applied to the outer peripheral surface of the coater roll is thinned with a doctor roll or a doctor blade, and the paint is applied to the surface of the substrate being transferred by the rotation of the coater roll. In the method of coating, the base material is made of various materials such as glass, resin, carbon, metal, etc., and is flat or continuous, such as film, sheet, plate, etc., both coater roll and doctor roll Alternatively, a hydrophilic DLC film (Diamond Like Carbon) is formed on the surface of one of the rolls, and the paint is a resist paint, conductive paint, insulating material, protective paint, reinforced paint, UV light shielding paint, charging Liquids (viscous paints) such as anti-coating paints, colored paints, coatings with low viscosity, liquid, water-soluble or organic solvent-soluble properties and drying at room temperature The coating applied to the outer peripheral surface of the coater roll is thinly leveled with a doctor roll rotating in contact with the coater roll or with a doctor blade in contact with the coater roll, and the coater roll is applied at room temperature and atmospheric pressure. In this method, the base material being transferred is coated with the coating material that is thinly leveled on the outer peripheral surface of the coater roll by rotating. The doctor roll may be an engraving roll with a hydrophilic DLC film in which a hydrophilic DLC film is formed on the surface of the engraving roll whose surface is engraved. The sculpture is preferably formed by forming various shapes, patterns, etc. with ultra-fine grooves of micrometer (μm) units, and having the hydrophilic DLC film formed on the surface and in the grooves. In the case of a doctor blade, the contact surface with the coater roll may be engraved and a hydrophilic DLC film may be formed on the surface. As in the case of the doctor roll engraving, the engraving in this case is also formed with various shapes, patterns, etc., with ultra-fine grooves in the micrometer (μm) unit. It is desirable that the hydrophilic DLC film is formed on the substrate.

  In the coating method, the rotation direction of the coater roll and the transport direction of the substrate can be reversed.

  In the coating method, the rotation speed of the coater roll can be 1 rotation or less while the substrate passes under the coater roll.

  In the coating method, the paint can be cooled directly or indirectly by cooling either or both of the doctor roll and the coater roll.

  In the coating method, the thickness of the substrate to be transferred is measured, and the distance between the doctor roll and the coater roll is adjusted according to the measurement result, or the height of the coater roll is adjusted automatically or manually. By doing so, the film thickness of the coating agent coated on a base material can also be adjusted by adjusting the space | interval of a coater roll and a base material.

[Paint coating equipment]
The paint coating apparatus of the present invention includes a doctor roll, a coater roll, and a paint supply apparatus, and the paint supplied from the paint supply apparatus and applied to the coater roll is thinned by contact between the coater roll and the doctor roll or the doctor blade. In the paint coating apparatus for coating the coating material on the surface of the coater roll onto the substrate being transferred by the rotation of the coater roll, both the coater roll and the doctor roll are hydrophilic on the roll surface. The doctor roll or doctor blade comes into contact with the coater roll, and the paint applied to the outer peripheral surface of the coater roll can be thinned and leveled by the rotation of the coater roll. , Apply the coating material on the surface of the coater roll to room temperature and atmospheric pressure. There are, of glass, is made of various materials of resin, carbon, metal, monoplane or continuous film, sheet, in which to allow the coating to the substrate of flat material such as a plate.

  The doctor roll of the coating apparatus has various shapes and patterns formed on the surface of the roll with grooves of ultrafine grooves in units of micrometers (μm), and a hydrophilic DLC film is formed on the surface of the engraving roll. It can be set as a sculpture roll with a hydrophilic DLC film. In this case, it is desirable that a hydrophilic DLC film is also formed in the groove of the engraving roll. It is desirable that the doctor blade is also engraved on the contact surface with the coater roll and has a hydrophilic DLC film formed on the surface. As in the case of the doctor roll engraving, the engraving in this case is also formed with various shapes, patterns, etc., with ultra-fine grooves in the micrometer (μm) unit. It is desirable that the hydrophilic DLC film is formed on the substrate.

  The coater roll of the coating apparatus may be rotatable in the direction opposite to the transfer direction of the substrate.

  The rotation speed of the coater roll of the coating apparatus is set to not more than one rotation while the substrate to be transferred passes through the coater roll in order to prevent uneven coating on the substrate due to excessive rotation of the coater roll. Is desirable.

  The coating apparatus may be provided with a paint cooling function in the paint supply apparatus so that the paint can be cooled, or a coolant passage is provided in one or both of the coater roll and the doctor roll, and the rolls are supplied by the coolant flowing through the coolant passage. The paint can also be cooled by cooling. In this case, a thermometer for measuring the temperature of the coating agent can be provided, and the coating agent can be cooled based on the measurement result. The thermometer is preferably a non-contact type.

[Effect of paint coating method on substrate]
The method for coating a base material of the present invention has the following effects.
1. Coating is easy because it is coated at room temperature and atmospheric pressure.
2. In the case of a functional coating agent that has a low viscosity, is liquid, is water-soluble or organic solvent-soluble, and has a property of drying at room temperature, the film formed on the substrate quickly (about several tens of seconds) Drying eliminates the need for forced drying, enables continuous high-speed coating operations, and improves film formation productivity. Further, since a functional film having a Vickers hardness of about 9H is coated, a scratch-resistant (weather resistant) coating substrate, for example, a panel for a solar power generator can be obtained. Moreover, since a coating base material having a light transmittance of about 80 to 96% is obtained, the light transmittance is good, and when used for the front panel of a solar power generator, the waste of sunlight is reduced, the refractive index is small, and the sunlight is reduced. A panel can be obtained that can be used effectively. Furthermore, since the contact angle of water is 3 ° or less, the water can easily flow, it is difficult for water to adhere to the panel, and a weather-resistant panel can be obtained.
3. Since both the coater roll and the doctor roll or one of the rolls with hydrophilic DLC formed on the surface are used, paints, especially water-soluble paints, are easy to adapt to the doctor rolls and spread easily. When the coater roll comes into contact with the doctor roll or the doctor blade, the paint applied to the coater roll becomes thin and uniform, and a coating substrate on which a thin film of 10 nm to 300 nm is formed is obtained. In this case, if the engraving roll with the DLC film formed on the surface of the engraving roll whose surface is engraved with ultrafine grooves in micrometer (μm) unit is used as the doctor roll, the paint is engraved. It becomes easy to become familiar with the roll, and it becomes easy to form a thin film with a uniform thickness on the surface of the substrate in the unit of nm (10 nm to 300 nm). Even if the contact surface of the doctor blade is engraved with ultra-fine grooves in micrometer (μm) units and a DLC film is formed on the surface, it is the same as when using an engraving roll with a DLC film Furthermore, it becomes easy to form a thin film with a uniform thickness.
4). If the rotation direction of the coater roll is set in the direction opposite to the transfer direction of the base material, the coating can be thinly coated.
5. If the rotation speed of the coater roll is set to 1 rotation or less while the base material passes through the coater roll, the coating film cannot be striped (coating unevenness and thickness unevenness), and can be formed into a uniform thickness.
6). If the paint is cooled, variations in film thickness due to temperature rise can be prevented, and film formation with a uniform thickness can be achieved.
7). Since the coater roll is in line contact with the base material and the paint is coated while following the surface of the base material, a thin film having a uniform thickness can be obtained.
8). It can be used in place of a conventional film forming method such as a spin coater method, a shower coater method, or a dipping method.
9. Since the distance between the coater roll and the base material is adjusted according to the thickness of the base material, the film thickness can be adjusted according to the thickness of the base material.

[Effect of paint coating equipment]
The paint coating apparatus of the present invention has the following effects.
1. Installation in a work environment is easy because it is placed in an environment of room temperature and atmospheric pressure. In addition, the coating equipment is simplified as compared with the conventional PVD method.
2. Since the hydrophilic DLC film is formed on the surface of the doctor roll, the coating material has a low viscosity, is a liquid, is soluble in water or an organic solvent, and is a functional coating agent having a property of drying at room temperature. A coating film having a thickness of 10 nm to 300 nm can be uniformly formed on the substrate.
3. Since there is a DLC film on the surface of both or one of the coater roll and doctor roll, the wear resistance of the doctor roll is improved and the doctor roll lasts longer. Further, since the frequency of replacing the doctor roll is reduced, maintenance is easy and economical. By the way, in the case of general doctor rolls using rubber or nickel / chrome plating, these materials have a large surface energy (high surface tension), and frictional heat generated by friction caused by contact between the doctor roll and the coater roll or external Although there is a concern about an increase in the paint temperature due to the air temperature, in the present invention using a roll having a hydrophilic DLC film on at least one of a doctor roll and a coater roll, the surface energy of these rolls is reduced and the hydrophilicity is improved. The friction between the doctor roll and the coater roll is reduced, and the temperature rise of the paint is small.
4). If the doctor roll is an engraving roll with ultra-fine grooves in micrometer (μm) units provided on the surface in various shapes such as lattice, honeycomb, curved, oblique line, etc. It is easy to enter the inside of the coater roll, and the paint applied to the coater roll is thin and uniform, and a coating film having a thickness of 10 nm to 300 nm is uniformly formed on the entire surface of the substrate. Can do. In addition, air pockets are less likely to be generated in the grooves, and bubbles are less likely to accumulate, which makes it difficult to form pinholes or the like in the coating film coated on the substrate. Even if the contact surface of the doctor blade is engraved with ultra-fine grooves in micrometer (μm) units and a DLC film is formed on the surface, it is the same as when using an engraving roll with a DLC film Furthermore, it becomes easy to form a thin film with a uniform thickness.
5. When the rotation direction of the coater roll is opposite to the transfer direction of the substrate, a thin film of 10 nm to 300 nm can be easily formed.
6). If the rotation speed of the coater roll is set to 1 rotation or less while the substrate passes through the coater roll, the coater roll does not contact the substrate for 1 rotation or more, so that the film cannot be striped (thickness). Unevenness) and a uniform thickness.
7). When equipped with a cooling function, coating can be performed directly or while cooling either or both of the doctor roll and coater roll. The film thickness variation due to temperature rise can be prevented, and a uniform thickness can be formed.

Explanatory drawing which shows an example of the coating material coating apparatus of this invention.

[Embodiment of paint coating method and paint coating apparatus on substrate]
The paint coating method and paint coating apparatus for a substrate of the present invention can be applied to a substrate used in various fields.

  As shown in FIG. 1, the paint coating apparatus of the present invention includes a guide roll 1, a doctor roll 2, a coater roll 3, and a backup roll 4. In this coating apparatus, when the substrate 5 is transferred in the direction of the arrow (left side in FIG. 1) by the rotation of the guide roll 1 and transferred to the top of the backup roll 4, the coating material is applied to the upper surface of the substrate 5 by the coater roll 3. 6 is applied.

  In the method of coating a base material of the present invention, the coating apparatus can be used, but other coating apparatuses can also be used. When using the coating apparatus, the coating apparatus is used in an environment of normal temperature and atmospheric pressure.

  The substrate may be a single leaf separated from each other or may be continuous. The base material is made of various materials such as glass, resin, carbon, and metal. The base material is a film, a sheet, a plate (panel), for example, a windshield of a solar power generator, a panel for an optical system (video equipment or office equipment), film, lens, organic EL film, inorganic EL film, TV Used in various fields such as display panels for personal computers and navigators, display panels and films for personal computers and portable devices, protective panels for lighting fixtures, glass for building materials and optical equipment, semiconductor wafers, protective panels for sensors, etc. Film, sheet, plate, panel, etc.

The paint used varies depending on the application of the substrate after film formation, but general-purpose resist paint (including functional resist paint), conductive paint, insulating paint, protective paint, reinforced paint, UV light shielding paint, antistatic It can be a paint, a colored paint, or the like. A functional coating agent can also be used as the paint. A functional coating agent that is water-soluble or organic solvent-soluble and has a low viscosity, for example, a viscosity of 1.3 Pa · s or less, is particularly suitable. Moreover, the coating agent which can prevent the stain | pollution | contamination of the panel surface, is hard to be damaged (it is excellent in weather resistance), is transparent, and does not become difficult to permeate | transmit light (it was excellent in light transmittance) is preferable. Moreover, in order to improve the adhesiveness to the base material formed into a film, what contains a binder is suitable. For example, a transparent inorganic binder having a content of silica (SiO ₂ ) having a particle diameter of 1 nm to 10 nm of 5% or less is suitable. The surface of every base material such as glass, stainless steel (metal), resin, etc. has fine irregularities that are not visible. By using a transparent inorganic binder containing silica having a particle diameter of 1 nm to 10 nm, the adhesion to the uneven surface is improved. In addition, functional materials such as photocatalytic titanium oxide and antistatic tin oxide that do not have an effect unless they are exposed on the surface of the substrate are likely to appear on the surface, and the characteristics of the functional coating agent are easily exhibited.

  As the functional coating agent, for example, AS-LR coat (liquid) of Japan Nanocoat Co., Ltd. is suitable. The AS-LR coat contains silica as an inorganic binder and uses the cohesive force (intermolecular force) of inorganic oxides centered on silica to suppress cohesive force that advances simultaneously with the exertion of the solvent. Thus, a thin film having high adhesion can be formed at room temperature. This functional coating agent has various characteristics such as antistatic, water stain prevention, infrared ray, ultraviolet ray cut, antireflection, low refraction, and sound insulation.

  In the method of coating a base material according to the present invention, although it varies depending on the material of the base material, for example, in the case of a resin or the like, it is also possible to form a paint film after applying a primer to the surface of the base material.

  The coating material 6 is supplied between the doctor roll 2 and the coater roll 3 or both and / or one of the doctor roll 2 and the coater roll 3. Of the paint 6 adhering to the surface of the coater roll 3, excess paint is scraped off by the doctor roll 2 that rotates in the opposite direction to the coater roll 3, and is applied to the substrate 5 with a uniform thickness. To do.

  When the coating material 6 is applied to the base material 5, the coater roll 3 is usually rotated in the same direction as the transfer direction of the base material 5 (normal rotation). It can also be rotated in the reverse direction (reverse rotation). Reverse rotation is suitable for thinning the film formation on the substrate 5. In the case of reverse rotation, it is necessary to make the rotational force of the coater roll 3 weaker than the transfer force of the substrate 5 so that the substrate 5 can be smoothly transferred.

  The rotation speed of the coater roll 3 is set to be less than one rotation while the base material 5 passes under the coater roll 3, so that the thickness of the coating applied to the base material 5 does not vary. Is desirable. If the coater roll 3 rotates one or more times while the base material 5 passes under the coater roll 3, contact unevenness (film thickness unevenness) of the paint to the substrate is likely to occur.

  For both or at least one of the doctor roll 2 and the coater roll 3, a roll having a hydrophilic DLC film (amorphous carbon film) formed on the roll surface can be used. By using the roll, it becomes easy for the hydrophilic coating material to become familiar with the DLC film, the coating material on the surface of the coater roll 3 easily spreads uniformly on the entire surface, and the coating material on the surface of the substrate 5 has a uniform thickness. It becomes easy to form a film. The doctor roll 2 has a hydrophilic DLC film on the surface of the engraving roll in which ultra-fine grooves of micrometer (μm) units are formed on the roll surface in various shapes such as a lattice shape, a spiral shape, an oblique line shape, and a honeycomb shape. The provided engraving roll with a hydrophilic DLC film can also be used. By using such a roll, it becomes easy for the hydrophilic coating material to conform to the roll surface, the coating material on the surface of the coater roll 3 tends to spread thinly and uniformly on the entire surface, and the coating material on the surface of the substrate 5 has a uniform thickness. It becomes easy to form a film. The surface material of doctor rolls is generally coated with rubber or nickel / chrome plating, but these materials are highly water-repellent and will be repelled if the paint is water-soluble. The pattern may be transferred to the substrate via the coater roll, but this is not the case with the present invention.

  The viscosity (fluidity) of the paint in the present invention is easily influenced by the outside air temperature. The coater roll is usually made of rubber. Rubber coater rolls are heated by continuous operation for a long time. When heated, the paint is heated to increase the viscosity and decrease the fluidity, making it difficult to form a thin and uniform film. In order to solve these problems, in the present invention, as shown in FIG. 1, the paint supply device (tank) 7 is provided with a temperature control function so that it is not near the paint 6 supplied between the doctor roll 2 and the coater roll 3. When a temperature sensor 8 for contact is provided, and the temperature detected by the temperature sensor 8 becomes high, the temperature control function is activated to cool the paint 6 in the paint supply device 7, and the paint 6 is applied to the doctor roll 2 and the coater roll. It is desirable to be supplied to either one of the rolls 2 or 3. Further, instead of providing the paint supply device 7 with a temperature control function, both or any one of the doctor roll 2 and the coater roll 3 can be provided with a temperature control function. Specifically, a refrigerant passage can be provided in the rolls 2 and 3, and the refrigerant passage such as water or gas can be supplied and cooled. In this case, a non-contact temperature sensor 8 is provided in the vicinity of either or both of the doctor roll 2 and the coater roll 3, and the sensor 8 detects the temperature of the rolls 2 and 3, and the paint supply device 7 It is also possible to control the operation of the provided temperature control function.

  The base material 5 is not necessarily constant in thickness but may be non-uniform, and may be distorted or warped. For example, even if the front panel for a solar power generator is the same standard product, the plate thickness varies from 0.01 to 0.1 mm. Since it is difficult to form a film with a uniform thickness on the entire surface of the substrate having such variation, a plate thickness sensor (for example, above the substrate 5 transferred by the guide roll 1 as shown in FIG. 1). A laser displacement meter) is provided, and the thickness detected by the sensor is compared with the base material dimensions as a reference, and if it is significantly different from the base material dimensions, a warning is generated and the transfer of the base material 5 is stopped. Uniform thickness on the substrate 5 by adjusting the height of both the roll 2 and the coater roll 3 or the height of the coater roll 3 or adjusting the distance between the doctor roll 2 and the coater roll 3 manually. It is desirable to be able to form a film.

Various methods are conceivable for forming a hydrophilic DLC film on the doctor roll 2 and the coater roll 3. One method is to form a hydrophilic DLC film previously developed by the present inventor and applied for a patent. It can depend on the membrane method. In this method, a roll is installed in a vacuum chamber, the inside of the chamber is brought to a normal temperature (preferably 20 ° C. to 50 ° C.) and in a vacuum state, and a high frequency is supplied from an RF high frequency power source to an RF electrode in the chamber to surround the roll Then, plasma is generated, and a negative high voltage pulse is applied to the roll from a high voltage pulse power source in the chamber to clean the surface of the substrate by ion etching. When the roll is a grooved roll (engraving roll), the inside of the groove is also cleaned during the cleaning. After the cleaning, DLC source gas and O ₂ are supplied into the vacuum chamber, and DLC (hydrophilic DLC) containing oxygen generated by reacting the source gas and O ₂ in the vacuum chamber is used as a surface layer of the roll. In this method, a hydrophilic DLC film is formed by depositing hydrophilic DLC on the surface of the DLC film while being injected into the surface. In this film forming method, before the formation of the hydrophilic DLC film, a Si-based gas containing at least O ₂ is supplied into the vacuum chamber, and the Si-based gas is decomposed in the vacuum chamber to form the surface of the substrate. An O ₂ -containing layer can be formed, and a hydrophilic DLC film can be injected and deposited on the O ₂ -containing layer. In this case, hexamethyldisiloxane (HMDSO) can be used as the Si-based gas. Further, before forming the hydrophilic DLC film, oxygen is contained while injecting DLC generated by supplying DLC source gas into the vacuum chamber and reacting the source gas in the vacuum chamber to the surface of the substrate. It is also possible to deposit a non-DLC film and form a hydrophilic DLC film on the surface of the DLC film. In this case, a mixing layer for enhancing the adhesion between the substrate and the DLC film can be formed before the DLC film is formed. The roll formed by the film forming method includes a hydrophilic DLC film formed by reacting a DLC source gas and O _{2 on} the surface of a cleaned substrate. The hydrophilic DLC film-forming substrate may include an O ₂ containing layer formed by decomposing and reacting a Si-based gas containing at least O ₂ between the substrate and the hydrophilic DLC film. Good. The O ₂ containing layer may be formed by a decomposition reaction of hexamethyldisiloxane (HMDSO). A DLC film not containing oxygen generated by reacting a DLC source gas may be provided between the substrate and the hydrophilic DLC film. A mixing layer for enhancing the adhesion between the base material and the DLC film may be provided between the base material and the DLC film. This roll can be a roll made of rubber, SUS, aluminum, or a metal roll whose surface is Cr plated or Ni plated. The thickness of the hydrophilic DLC film is preferably about 0.2 to 5 μm. The hydrophilic DLC film preferably has a hardness of 800 to 2500 HV.

  As the doctor roll and coater roll in the present invention, rolls made of various materials such as an aluminum roll, a carbon roll, a resin roll, a rubber roll, a CFRP roll (carbon fiber reinforced plastic roll), a metal roll, and a non-ferrous metal roll can be used. Some metal rolls have Cr (chrome) plating or Ni (nickel) plating on the surface.

  Although the said description is a case where a doctor roll is used, it can replace with a doctor roll and can also use a doctor blade in this invention. Also, a doctor roll and a doctor blade can be used in combination.

  In the present invention, if the above-mentioned problems can be solved, the substrate may be of a field, shape, or material other than the above-described substrate, and the film wound in a roll shape is pulled out and coated while being rolled up. You can also. A paint other than the above-mentioned paint can also be used, and a doctor roll, a coater roll, a doctor blade, and the like may be other than those in the above embodiment.

DESCRIPTION OF SYMBOLS 1 Guide roll 2 Doctor roll 3 Coater roll 4 Backup roll 5 Base material 6 Paint 7 Paint supply apparatus 8 Temperature sensor

Claims (13)

In the method of coating the surface of the substrate being transferred with the coating applied to the coater roll (including the functional paint: the same applies hereinafter) by rotating the coater roll,
The substrate is a monoplane or continuous film, sheet, plate,
Both or one of the coater roll and doctor roll is a film in which a hydrophilic DLC film is formed on the roll surface,
The doctor roll or the doctor blade is brought into contact with the coater roll, and the paint applied to the outer peripheral surface of the coater roll is thinly leveled.
The coating material thinly applied to the outer peripheral surface of the coater roll is coated on the substrate being transferred at room temperature and atmospheric pressure by rotating the coater roll.
A method for coating a base material with a paint. In the coating method to the base material of Claim 1,
The doctor roll is a roll in which a hydrophilic DLC film is formed on the surface of a sculpture roll engraved with ultrafine grooves in micrometer (μm) units on the roll surface.
A method for coating a base material with a paint. In the coating method to the base material of Claim 1 or Claim 2,
The direction of rotation of the coater roll and the direction of substrate transfer are reversed.
A method for coating a base material with a paint. 4. The coating method for a base material according to claim 1, wherein the rotation speed of the coater roll is set to be not more than one rotation while the base material passes under the coater roll. 5. ,
A method for coating a base material with a paint. In the paint coating method to the base material of any one of Claims 1-4,
Cooling the paint directly or indirectly by cooling either the doctor roll and / or the coater roll,
A method for coating a base material with a paint. In the coating method to the base material of any one of Claims 1-5,
Measure the thickness of the substrate to be transferred and adjust the distance between the coater roll and the substrate by adjusting the distance between the doctor roll and the coater roll or the height of the coater roll according to the measurement result. And adjust the film thickness of the paint to be coated on the base material,
A method for coating a base material with a paint. A doctor roll, a coater roll, and a paint supply device are provided, and the paint supplied from the paint supply device and applied to the coater roll is thinned by contact with the coater roll and the doctor roll or doctor blade, and by rotating the coater roll, In the paint coating apparatus for coating the coating material on the surface of the coater roll on the substrate being transferred,
Both or one of the coater roll and doctor roll is a film in which a hydrophilic DLC film is formed on the roll surface,
The doctor roll or doctor blade is in contact with the coater roll, and can thinly level the paint applied to the outer peripheral surface of the coater roll,
By the rotation of the coater roll, the coating material on the surface of the coater roll can be applied to a substrate that is single-leaf or continuous in an environment of normal temperature and atmospheric pressure.
A paint coating apparatus characterized by that. The paint coating apparatus according to claim 7, wherein
The doctor roll is the roll surface, the doctor blade is the contact surface to the coater roll, and the surface of the engraving roll engraved with ultra-fine grooves in micrometer (μm) units is a hydrophilic DLC film. is there,
A paint coating apparatus characterized by that. The paint coating apparatus according to claim 7 or 8,
The coater roll is rotatable in the direction opposite to the direction of transfer of the substrate.
A paint coating apparatus characterized by that. The coating liquid coating apparatus according to any one of claims 7 to 9,
The rotation speed of the coater roll is not more than one revolution while the substrate passes through the coater roll.
A paint coating apparatus characterized by that. The paint coating apparatus according to any one of claims 7 to 10,
The paint supply device has a paint cooling function,
A paint coating apparatus characterized by that. The paint coating apparatus according to any one of claims 7 to 11,
The refrigerant path is provided in both or either of the doctor roll and the coater roll, and the paint can be cooled by cooling those rolls with the refrigerant flowing through the refrigerant path.
A paint coating apparatus characterized by that. The paint coating apparatus according to any one of claims 7 to 12,
A thermometer was installed to measure the temperature of the paint, and the paint could be cooled based on the measurement results.
A paint coating apparatus characterized by that.

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